Valve stem guide and seat reamer



R. M: CHADSEY.

VALVE STEM GUIDE AND SEAT REAMER. APPLICATION FILED IULY25. m9.

1,361,682., Patented Dec. 7, 1920.

2 SHEETS-SHEET I.

7 7 Elwvawtoz Gamma R. M. CHADSEY.

VALVE STEM GUIDE AND SEAT REAMERH APPLICATION FILED JULYZS. 1919.

Patented Dec. 7,1920.

2 SHEETS-SHEET 2.

ROBERT M. CHADSEY, OF ORCUTT, CALIFORNIA.

VALVE STEM GUIDE AND SEAT REAMER.

Specification of Letters Patent.

Patented Dec. *7, 1920.

Application filed July 25, 1919. Serial No. 313,190.

To all whom it may concern.

Be it known that I, ROBERT M. OHADSEY, a citizen of the United States,residing at Orcutt, in the county of Santa Barbara and State ofCalifornia, have invented new and useful Improvements in Valve StemGuides and Seat Reamers, of which the following is a specification.

The object of the invention is to provide a device adapted for grindingthe valve seats of internal combustion engines. To this end the devicecomprises a suitable guide for clamping on top of the engine casing.This guide carries a reamer for truing the valve seat and there iscarried by the said reamer a second reamer for truing the valve stemguide. The guide forming a part of the invention being attachable to theengine casing insures the true reaming of both the valve seat and thevalve stem guide. Attendant on the improved device there is an improvedfeeding means operative in connection with both reamers and the two aredesigned for turning by an appropriate handle which is detachablysecured to one.

As a further object the invention seeks the provision of a device ofthis character which is simple in construction, durable and effective inoperation and inexpensive to manufacture.

Other and further objects appear in the following description whereinthe invention is set forth in detail.

As shown and described, a specific em bodiment of the invention isadhered to but to this embodiment the invention is not to be restricted.Actual practical application may suggest certain desirable changes oralterations and the right is claimed to make any which do not deviate inscope from the subjoined claims.

The same numerals of reference designate the same parts throughout theseveral figures of the drawings, wherein:

Figure 1 is a central vertical sectional view through the improveddevice.

Fig. 2 is a top plan view of the structure in Fig. 1.

Fig. 3 is a side elevational View of the valve seat reamer, the stem ofthe guide reamer being carried within the seat reamer.

Fig. 4 is a side elevational view of the valve stem guide reamer.

Fig. 5 is a side elevational view of the externally threaded collaremployed for feeding the reamers to their work.

As shown, the invention comprises a reamer guide element formed with atubular body 1 and a base-flange 2. This tubular guide element isadapted for attachment" on top of the engine casing after the removal ofthe valve housing. It is secured to the casing in place of the valvehousing by means of appropriate cap screws 3, the flange 2 ondiametrically opposite sides being formed with radially disposed slots4: through which screws 3 pass to thread into the engine casing.

Within the tubular member there is carried a valve seat reamer 5 whichis of tubular form, this reamer 5 at one end being of conical shape andprovided with teeth 6 on its conical surface, this end of the reamerconforming to the valve seat to be reamed, so that the teeth may operateon the valve seat to restore it to the proper shape, after the seat hasbecome worn.

The reamer is adapted for free turning movement in the tubular member 1and if it is axially alined with the valve stem guide seat, as it willbe when the guide element of the device is attached to the enginecasing, the seat will obviously be turnedv true when the reamer isoperated.

In the device provision is made for truing or reaming the valve stemguide and to this end there is provided a'reamer 7 of slightly taperingshape to permit its readily entering the valve stem guide. The passageof this reamer 7 through" the valve stem guide will serve to'true thatif the reamer is properly alined. Provision is made for such properalinement by providing the reamer with a shank 8 of approximately thesize of the valve stem. This shank 8 connects with a larger shank 9whichpasses through the tubular valve seat reamer 5, being snuglycarried in the latter which insures the reamer 7 being properly alinedwith the reamer 5 and, since this is properly alined by means of theguide element of the device, the reamer 7 is perforce properly alined.The reamer 7 is turned by hand and to this end the upper end of theshank 9 is formed with a square or polygonal head portion 10 thedistance between that and the diagonally opposite corners of which isequal to or less than the diameter of the shank 9, so that the shank 9may be slid through the reamer 5 from either end. This square orpolygonal head 10 is provided for engagement with a suitable Wrench orhandle 11 by means of which the shank and with it the reamer 7 may beturned. The reamer 5 at the end remote from the cutting teeth 6 isreduced in diameter, as indicated at 12, thus providing a shoulder 13adjacent the upper end; of the reamer 5. In surrounding relation to thisreduced portion 12 there is an externally threaded collar 14: whichscrews into the upper end of the tubular member of the guide element,the latter bein externally threaded at. its upper end. 'lhis collar 14at one end is formed with a square or polygonal portion 15 with which asuitable wrench may be engaged, so that the collar may be turned. Ifturned in a direction to screw it into the sleeve member 1, the loweredge of. the collar bears on the shoulder 13 and serves to force thereamer 5 against its'work. The collar 14, therefore, acts as a feedingmeans for the reamer 5. r

The reamer 7 is designed to be turned in dependently of the reamer 5 butin order that the handle 11 may serve to turn both reamerssimultaneously, the shank 9 of the valve .stem guide reamer isv formedwith a peripheral groove 16 in which there seat the ends of set screws17 passed radially through the reduced portion 12 of'the reamer 5 atdiametrically opposite points. If the set screws 17 be. loose the reamer7 may obviously be turned independently of the reamer 5, the latterat-this time acting only as a guide for the reamer 7. If the two are tobe turned simultaneously however, the tightening of the screw 17 effectsan operative connection between the two reamers and the turning of thehandle 11 will serve to rotate both. As the teeth of the two removechips from the parts upon which they are working the. collar 14 may beturned to force it against the shoulder 13, whereupon both reamers arefed to their work and if both are being rotated, both the valve seatand.

with the first said reamer, and means whereby the one reamer may beturned independently of the other or the two turned in unison.

2. A tool for the purpose specified consisting of a guide elementattachable to an engine casing, a valve seat reamer carried by theguide, a valve stem guide reamer also supported by the guide and axiallyalined with the first said reamer, means for rotating the valve stemguide reamer, means for operatively connecting the seat reamer with thesaid guide reamer, and means for feeding the seat reamer to its work.

8. A tool for the purpose specified embodying a guide element consistingof a tubular member and a flange, means for at.- taching the guideelement to an engine casing adjacent the valve seat, a tubular valveseat reamer carried 1n the tubular member.

of the guide element, a valve stem. guide reamer having a shank disposedwithin, thetubular member and a. flange, mean-sfor at:

taching the tubular element to an engine casing ad acent the valve seatthereof, a tubular seat reamer disposed wlthm the tubular member. of theguide element, said reamer being formed with a shoulder adjacent itsupper end, a collar threadingly engaged in the tubular member of theguide element and bearing upon said shoulder, a gulde reamer formed witha shank disposed within the tubular seat reamer, means for turning theseat reamer, and means for securing the shank of the guide reamer tothe.

seat reamer, whereby onereamer may be turned independently of the otheror. the two turned in unison,-the aforesaid. collar providing means forfeeding the said reamers to their work. r

In testimony whereof I aflix my signature.

ROBERT M. CHADSEY;

